摘要
以往通过采用160℃液体的降温研究和技术优化,实现200℃超高温储层抗高温造长缝技术难题,但液体用量大、成本高。以丙烯酰胺类单体为主要原料,研制出一种新型耐高温三元聚合物稠化剂,并配套形成了耐200℃压裂液体系。冻胶体系无色透明、弹性好,可完全挑挂,在200℃、170 s-1条件下剪切2 h后黏度可达170 mPa·s,抗高温耐剪切性能好,具有较好的支撑剂悬浮能力和降滤失性能,破胶液黏度小,界面张力低,残渣含量仅为41 mg/L,具有低伤害特征,且降摩阻性能好。该压裂液在牛东101井获得了成功应用,在用液量仅为牛东1井50%的情况下,仍获得日产油63 m3/d、日产气10.2×104 m3/d的高产、稳产效果,使增产措施成本降低45.6%,为超高温储层改造提供了有效的压裂液体系。
Long fracturing in high temperature(200 ℃) reservoirs was in the past achieved by cooling down of fracturing fluid of 160 ℃ and optimization of relevant techniques. This technology was expensive and needed plenty of fluid. Aterpolymer thickening agent was developed using acrylamide as the major raw material, and a fracturing fluid was prepared with the newly developed terpolymer. This fracturing fluid is stable at high temperature of 200 ℃, and the gel formed is transparent and has good elasticity. After shearing 2 hours under 200 ℃ and 170 s-1, the viscosity of the fracturing fluid is still 170 mPa·s, meaning that the fracturing fluid has good suspending capacity and filtration property. The fracturing fluid after gel-breaking has low surface tension and the residue content is only 41mg/L, characteristic of low impairment to pay zones and low friction. This fracturing fluid was used in Well Niudong-101, in which daily production of 63 m3 oil and 10.2×104 m3 natural gas was obtained at half fluid consumption of the Well Niudong-1, and the cost spent in stimulating was reduced by 45.6%. This new fracturing fluid can be used in improving the production of ultra high temperature reservoirs.
出处
《钻井液与完井液》
CAS
北大核心
2014年第3期75-77,101,共3页
Drilling Fluid & Completion Fluid
基金
国家科技重大专项"低渗
特低渗油气储层高效改造技术"(2011ZX05013)
股份公司重大专项2011B-1202"低/特低渗透油藏有效开发技术"
关键词
超高温井
增产措施
压裂液
稠化剂
三元聚合物
牛东101井
Ultra high temperature well
Stimulation measure
Fracturing fluid
Thickening agent
Terpolymer
Well Niudong-101
